I have between 20-30 puzzles in total in my classroom. I only have between 5-10 out in the classroom, the others are stacked in my supply closet. Whenever I want to change out puzzles, I have to unload the whole stack to sort through which I want (there are different levels of hardness). Anybody have a good way to store puzzles individually so I can pull some out without losing pieces everywhere? The only thing I can think of is the large Ziploc bags, and that would be expensive for the amount of puzzles I have.